[gnutls-devel] GnuTLS requires a C99 compiler on W32

[LRN]

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GnuTLS uses gnulib's time.h, which has the following:
_GL_FUNCDECL_RPL (localtime_r, struct tm *, (time_t const *restrict
__timer, struct tm *restrict __result) _GL_ARG_NONNULL ((1, 2)));

"restrict" is a keyword that requires -std=c99 (using mingw-w64 gcc
4.8.1), otherwise you get:

In file included from ./includes/gnutls/gnutls.h:49:0,
                 from ../../gnutls-3.2.4/lib/tpm.c:30:
./../gl/time.h:468:1: error: expected ';', ',' or ')' before '__timer'
 _GL_FUNCDECL_SYS (localtime_r, struct tm *, (time_t const *restrict
__timer,
 ^
./../gl/time.h:490:1: error: expected ';', ',' or ')' before '__timer'
 _GL_FUNCDECL_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
 ^

The "#define restrict __restrict" from config.h doesn't reach gnulib
here, because tpm.c doesn't include config.h

Adding
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
to tpm.c fixes this.

There is another problem that prevents GnuTLS from building, but it's
unrelated to this, so i'll start a new thread for it.

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